Yes they are worth. They provide not only the benefit of expertise, But they also ease the pressure on your gear for reaching the expertise cap [like precision does for hit] and open up the oppurtunity for other gear choices with other stats for better dps.
you can tell by the talents positions and pre-req that its very relevant.
Read his Theophany's topic thats stickied at the top of the rogue topics
Edited, Apr 5th 2009 6:40am by Tenjen